Family Echinarachniidae Lambert and Thiéry 1914 (sand dollar)

Echinoidea - Clypeasteroida - Echinarachniidae

Full reference: J. Lambert and P. Thiéry. 1914. Essai de nomenclature Raisonnée des échinides. L. Ferrière, Chaumont (4)241-320

Parent taxon: Scutelliformes according to A. Kroh and A. B. Smith 2010

See also Durham 1966 and Linder et al. 1988

Sister taxa: Abertellidae, Astriclypeidae, Dendrasteridae, Eoscutellidae, Mellitidae, Monophorasteridae, Placatenellidae, Protoscutellidae, Rotulidae, Scutasteridae, Scutellidae, Taiwanasteridae

Subtaxa: Astrodapsis Echinarachnius Kewia Nipponaster Remondella Tenuirachnius Vaquerosella

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Type: Echinarachnius

Ecology: slow-moving semi-infaunal detritivore

Distribution:

• Pliocene of Mexico (1 collection), Taiwan (1), United States (4: Alaska, California)

• Miocene of United States (47: California, New Jersey)

• Oligocene of United States (3: California, Oregon)

Total: 56 collections including 75 occurrences

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